Maine State Senator Emily Cain is eyeing a congressional run, but says her decision hinges on whether current U.S. Congressman Mike Michaud decides to run for governor in 2014. Michaud said earlier this week he was considering challenging Governor Paul LePage next year.Cain, an Orono Democrat, says she’s always been a big fan of Michaud and will support him in whatever decision he makes. “The fact that he is now talking publicly about his potential interest in running for governor means there’s an opportunity,” Cain told WABI TV5 Wednesday. “I am seriously considering what it will mean for me to run for the second congressional district.”Those close to Cain say if Michaud, now serving his sixth term in Congress, opts for a run at the Blaine House in 2014, she will definitely be running for his vacant seat.Cain is serving her first term in the Maine Senate after four terms in the House of Representatives. She served as House minority leader in 2011, when the Legislature was controlled by Republicans. Last year when Olympia Snowe announced her decision not to run for re-election it set off a firestorm of potential candidates to fill that seat. That list included Michaud, who briefly sought Snowe’s coveted Senate seat before opting to remain in Congress.During Michaud’s flirtation with the U.S. Senate, Cain decided then to run for his Congressional seat. “I think, technically, for three days I was running for Congress, which was a great congressional campaign and successful for what it needed to be. Now, a year later, with the election being nearly 20 months away, there’s an opportunity to have a more thoughtful process.”In the past few weeks, Cain says she’s spoken with friends, family and colleagues about the possibilities and challenges of representing Maine’s second district. “It’s fun to talk about, but it’s also something I’m taking very seriously.”If Michaud decides to run for governor next year, it sets up a potentially fascinating 3-way showdown between Governor Paul LePage, Independent Eliot Cutler, and Michaud, arguably the most popular Democrat in Maine.